CN104167329B - High-precision electrothermal relay - Google Patents
High-precision electrothermal relay Download PDFInfo
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- CN104167329B CN104167329B CN201310185943.1A CN201310185943A CN104167329B CN 104167329 B CN104167329 B CN 104167329B CN 201310185943 A CN201310185943 A CN 201310185943A CN 104167329 B CN104167329 B CN 104167329B
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- lever
- pointer
- electrothermal relay
- spacing
- push rod
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Abstract
A kind of high-precision electrothermal relay is made of metal movable plate, pointer, digital scale ruler, guide plate, lever 1, lever 2, lever 3, push rod, switch, current calibration knob, test key, and pointer is equipped in lever 3, and pointer length is 5 times of 3 arm of force of lever；Alloy movable plate null offset bring error rotates lever 2 by guide plate, push rod rotation, indicators turn, finally spacing between push rod initial position and push rod final position (trip positions) is made to change, the variation of spacing amplifies 10 times by the pointer gauge that pointer and digital graduated scale are constituted, electrician can judge the interval error of electrothermal relay according to the number that pointer gauge is shown, can do you judge that electrothermal relay effective protection motor? current calibration knob can be changed spacing and correct error, the spacing of electrothermal relay is set to return zone of reasonableness, guarantee that electrothermal relay protection feature all meets standard in use, the electrothermal relay for preventing error from very much not shielding is used for a long time, greatly reduce motor and burns out quantity.
Description
Technical field
The present invention relates to a kind of electrothermal relays for protecting motor, especially a kind of to survey push rod initial position and push rod end
The high-precision electrothermal relay of distance between point position (trip positions).
Background technique
Currently, electrothermal relay is the low tension of yield maximum, the maximum protection motor of usage amount in industrial and agricultural production
Device accounts for 90%, and motor protector (containing computer-shape) is less than 10%.The motor amount of burning out of annual electrothermal relay protection is more than 100,000,000
Platform.But motor the main reason for largely burning out of people's electrothermal relay protection, is not all understood: do not know both at home and abroad heat after
There is " spacing " (distance between push rod initial position and push rod final position) in electric appliance, it is not known that the method for surveying spacing, it is not known that
It the use of spacing is more than meeting when zone of reasonableness electrothermal relay protection feature cannot meet standard, the motor overload that electrothermal relay is protected
Largely burn out！In fact, spacing not only can not be surveyed directly！And it is invisible！But objective reality！It is that can relationship electrothermal relay
The most important technological parameter of effective protection motor！Due to not finding the method for surveying spacing for a long time, the motor of electrothermal relay protection is a large amount of
The reason of burning out is unclear, and problem cannot solve for a long time！In various magazines, in textbook, on eelctrical engineering handbook, on the net about heat
The saying for the reason of motor of relay protection is largely burnt out all is wrong！Just it is stuck in spacing！
The motor of electrothermal relay protection is burnt out every year more than 100,000,000: wherein 80% (80,000,000, hundred million) loss 1000 is to make
Be more than zone of reasonableness, the electrothermal relay for not being able to satisfy using protection feature standard with spacing, remaining account for 20% (insulating layer aging,
Lightning stroke, bimetal leaf are burnt).Usual people's mistake thinks that when overload, stall, bearing fault, machinery are stuck be electrothermal relay
The reason of motor of protection largely is burnt out? this is external cause in fact, uses " spacing " not to be only in the electrothermal relay of zone of reasonableness and makes
The main reason for burning out at the motor that electrothermal relay is protected (internal cause), " spacing " meets standard in zone of reasonableness, protection feature,
Electrothermal relay can thread off when overload, stall, bearing fault, machinery are stuck, and motor will not burn out or burn few！Internal cause, which rises, to be determined
Property effect！Just as two points distinguish narrow heart patient often because tired climbing, excitement etc. are outer thus death！Internal cause is that two points distinguish narrow
It is narrow！Tired climbing, excitement etc. are external causes, and tired climbing, excitement etc. will not make one dead.As long as finding calorimetric relay spacing side
Method makes electrothermal relay spacing in zone of reasonableness, and electrothermal relay protection feature can meet standard for a long time, can greatly reduce motor
Burn out quantity！But it since spacing changes very small (the 0.2mm order of magnitude), can not visually differentiate, it is necessary to amplify 10 times of naked eyes
It can differentiate, it is just with practical value！
After electrothermal relay uses the Jia time, since the alternating of high/low temperature changes, the alloy movable plate in bimetal leaf will
Phase transformation is generated, i.e. alloy microstructure, crystal arrangement changes, and causes the line coefficient of dilatation of alloy movable plate to generate and sharply becomes
Change, the size of the internal stress (thermal stress, mechanical stress, residual stress) of alloy movable plate, distribution change, the variation of internal stress
Make the elasticity modulus of alloy movable plate, change than physical quantitys such as bendings, alloy movable plate generates null offset, i.e. alloy movable plate not
It can return to original state, since alloy movable plate, guide plate, lever sequentially couple, at the beginning of alloy movable plate null offset finally makes push rod
Beginning position and push rod final position (trip positions) between spacing change, this is irresistible thermodynamic process！Alloy
Movable plate null offset makes spacing change and (become larger).
In addition setting current changes, and motor working current size makes push rod initial position change, push rod final position
(trip positions) be it is fixed, finally become spacing between push rod initial position and push rod final position (trip positions)
Change, that is, previously defined " spacing " changes.
Common electrothermal relay is not measured, is shown, amplifying spacing function, and electrician does not know is using the spacing of middle electrothermal relay
No in zone of reasonableness, whether protection feature meets standard, can only allow spacing not in zone of reasonableness, protection feature is not able to satisfy standard
Electrothermal relay be used for a long time, cause electrothermal relay protect motor largely burn out；Digital type thermal relay
(200910104701.9) there is pointer gauge, be characterized in that pointer and push rod can survey spacing in same lever, but precision is low, lever
The ratio between upper indicators turn radius and the push rod radius of gyration≤5 times, it is low that spacing is amplified multiple, the reason is that by it is empty in electrothermal relay,
Technique limitation, half warp of push rod rotation cannot be too small, and pointer length cannot be too long.
Summary of the invention
In order to overcome common electrothermal relay not measure display and amplify spacing function, digital type thermal relay
(200910104701.9) there is pointer gauge, spacing can be surveyed, but precision is low (spacing amplifies 3-5 times).The present invention provides a kind of high-precision
Electrothermal relay is spent, spacing can be not only surveyed, also spacing can be amplified 10 times, electrician can determine whether that electrothermal relay spacing is by pointer gauge
It is no to judge whether electrothermal relay protection feature meets standard, and this adjustable spacing in zone of reasonableness, error is corrected, is prevented
The big electrothermal relay not shielded of error is used for a long time, and achievees the purpose that effective protection motor.
The technical solution adopted by the present invention to solve the technical problems is:
The present invention increases a lever 3 in electrothermal relay, is characterized in that pointer and push rod in 3 lever 2 of lever, are shouldered respectively
On vertical sidewall, the arm of force (stress point to shaft distance) is connected 3 fixed pivot of bar with guide plate, and resistance arm is pointer, pointer to
On pierce into the slot for having digital scale ruler on the side in adjusting panel, pointer, digital scale ruler constitute pointer gauge, refer to
Than being 5 times between needle length and the arm of force, any minor change of guide plate amplifies 5 times, while guide plate also control lever by pointer
2, the ratio between 2 upper push-rod radius of turn of lever and arm of force radius of turn for being controlled by guide plate 1:2 (approximate), push rod moving distance are to lead
Plate moving distance 1/2 (approximation)；When guide plate is mobile, pointer rotation in the rotation of 2 upper push-rod of lever, lever 3, it is clear that pointer rotation away from
It is 5 times of guide plate from 10 times for push rod rotary distance.Pointer gauge shows that number is 10 times of distance values of amplification, measures spacing in this way,
Amplify spacing.
Pointer gauge is the metrical instrument for surveying spacing, can just use after school zero, calibration
School zero: test key, switch trip, pointer gauge 0 are stirred
Calibration: with qualified electrothermal relay, the pointer tabular value under 0.8,0.9,1.0 Ie electric currents is surveyed, electric current and spacing are obtained
(pointer tabular value) table of comparisons.
Current regulation knob or current regulation bar are for changing spacing: due to alloy movable plate null offset bring error
Make the rotation of lever 2, push rod rotation by guide plate, alloy movable plate null offset bring error finally makes spacing change, benefit
The rotation of lever 1, lever 2 can be made to rotate with the eccentric wheel of current regulation knob, push rod position is made to change, become spacing
Change.Electric current tunes up, and spacing becomes larger, and vice versa, the error that the null offset for correcting alloy movable plate with it generates.
Electrician can determine whether high-precision electrothermal relay spacing is closing by the table of comparisons (pointer gauge number compares current value)
Range is managed, the error size of high-precision electric appliance is judged, judges whether high-precision electrothermal relay protection feature meets standard！Judgement is high
Can precision electrothermal relay effective protection motor? the high-precision electrothermal relay for preventing error from very much not shielding makes for a long time
With.The motor for protecting high-precision electrothermal relay burns out quantity and greatly reduces.
Of the invention has the following advantages compared with digital type thermal relay:
In digital type thermal relay, spacing can only be amplified 3-5 times, the present invention refers on same lever by pointer and push rod
Spacing can be amplified 10-20 times respectively in 3 lever 2 of lever by needle and push rod, precision raising, and technological progress is obvious！Protecting effect
More preferably.
The present invention has the following advantages compared with electrothermal relay:
Amplified with pointer gauge and shows distance values
Specific embodiment:
Fig. 1 is the top view of first embodiment of the invention.
Fig. 2 is the A--A cross-sectional view of Fig. 1.
In figure:
1. metal movable plate, 2. guide plates, 3. test keys, 4. lever, 1,5. lever, 2,6. lever, 3,7. pointer, 8. push rods are initial
Position, 9. push rod final positions (trip positions), 10. push rods, 11. eccentric wheels, 12. reaction spring pieces, the rotation of 13. current calibrations
Knob, 14. switches, 15. digital scale rulers, 16. slots, 17. adjusting panels, 18. lever, 3 arm of force
In Fig. 1: on adjusting panel (17), there is digital scale ruler (15), pointer (7), current calibration knob (13), rectangular
Shape hole (16) is tested key (3).It is made of pointer gauge (19) pointer (7), digital scale ruler (15), 0 position of pointer is tripping position
It sets, pointer gauge number is the 12 amplified distance values of expression, indicates push rod initial position to push rod final position (trip positions)
Required moving distance.Pointer-digit is bigger, indicates that spacing is bigger, and vice versa,
In Fig. 2: metal movable plate (1) fever, bending after energization are moved to the left guide plate (2), guide plate pushes away lever 2 (5) above
Bar (10) rotates clockwise, and rotates clockwise pointer (7) on lever 3 (6), the pointer length on lever 3 and the arm of force (18) it
Between than being 5 times, 2 upper push-rod radius of turn of lever is rotated with the ratio between the arm of force radius of turn that is controlled by guide plate 1:2 (approximate), pointer
Distance is 10 times of push rod rotary distance, is 5 times of guide plate, and pointer gauge (19) shows that number is 10 times of distance values of amplification.Metal is dynamic
Piece null offset is equivalent to metal movable plate (1) and moves right, guide plate (2) is made to move right, lever 2 (5) upper push-rod (10) inverse time
Needle rotation, makes spacing become larger, and null offset stack error can make spacing be more than zone of reasonableness.
Adjusting the eccentric wheel (11) on current calibration knob (13) can be such that lever 1 (4) rotates counterclockwise, make on lever 1
Push rod on lever 2 (5) rotates (move right) counterclockwise, reduces spacing, vice versa.It is changeable with current calibration knob
Spacing can correct spacing stack error, so that spacing is returned zone of reasonableness, so that the protection feature of electrothermal relay is met standard, protected
The motor of shield will not be burnt out because overloading disconnected phase.
Pointer (7) makes of fine wire.
Above-mentioned improvement does not influence former electrothermal relay mechanical transmission course, not will increase resistance, simply.
Claims (2)
1. a kind of high-precision electrothermal relay, including metal movable plate (1), pointer (7), digital scale ruler (15), guide plate (2), lever
One (4), lever two (5), lever three (6), push rod (10), switch (14), current calibration knob (13), test key (3), it is special
Sign is: installing pointer (7) on lever three (6), installation can push the push rod (10) of reaction spring piece (12), thick stick on lever two
Bar two, lever three the arm of force be inserted into guide plate aperture respectively, pointer (7) pierces into slot on adjusting face (17) upwards
(16), slot side is equipped with digital scale ruler (15), and pointer and digital graduated scale constitute pointer gauge (19), and pointer length is big
In the arm of force (18) length connecting with guide plate, the radius of turn of push rod is less than the radius of turn of the arm of force controlled by guide plate.
2. a kind of high-precision electrothermal relay as described in claim 1, it is characterized in that: lever three (6) fixed pivot is in vertical side
On wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310185943.1A CN104167329B (en) | 2013-05-17 | 2013-05-17 | High-precision electrothermal relay |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310185943.1A CN104167329B (en) | 2013-05-17 | 2013-05-17 | High-precision electrothermal relay |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104167329A CN104167329A (en) | 2014-11-26 |
| CN104167329B true CN104167329B (en) | 2018-12-04 |
Family
ID=51911105
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310185943.1A Expired - Fee Related CN104167329B (en) | 2013-05-17 | 2013-05-17 | High-precision electrothermal relay |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104167329B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102054629A (en) * | 2009-11-10 | 2011-05-11 | 郭永明 | Digital thermorelay |
| CN102298865A (en) * | 2010-06-23 | 2011-12-28 | 上海市嘉定区第二中学 | Metal thermal expansion and tiny deformation magnify demonstration instrument |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2660793B1 (en) * | 1990-04-06 | 1992-07-03 | Telemacenique | THERMAL RELAY. |
| JPH0467525A (en) * | 1990-07-09 | 1992-03-03 | Fuji Electric Co Ltd | Thermal overload relay |
| JP3298428B2 (en) * | 1996-05-22 | 2002-07-02 | 富士電機株式会社 | Inverted spring contact switching mechanism and thermal overload relay |
| CN2279694Y (en) * | 1996-10-17 | 1998-04-22 | 陈英钟 | Double-metal plate thermal relay |
| JP2009193785A (en) * | 2008-02-13 | 2009-08-27 | Fuji Electric Fa Components & Systems Co Ltd | Thermally operated overload relay |
-
2013
- 2013-05-17 CN CN201310185943.1A patent/CN104167329B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102054629A (en) * | 2009-11-10 | 2011-05-11 | 郭永明 | Digital thermorelay |
| CN102298865A (en) * | 2010-06-23 | 2011-12-28 | 上海市嘉定区第二中学 | Metal thermal expansion and tiny deformation magnify demonstration instrument |
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| Publication number | Publication date |
|---|---|
| CN104167329A (en) | 2014-11-26 |
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Granted publication date: 20181204 Termination date: 20190517 |